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CO2 Separation from flue gas using polyvinyl-(room temperature ionic liquid)–room temperature ionic liquid composite membranes / Pei Li in Industrial & engineering chemistry research, Vol. 50 N° 15 (Août 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp. 9344-9353 Titre : CO2 Separation from flue gas using polyvinyl-(room temperature ionic liquid)–room temperature ionic liquid composite membranes Type de document : texte imprimé Auteurs : Pei Li, Auteur ; K. P. Pramoda, Auteur ; Tai-Shung Chung, Auteur Année de publication : 2011 Article en page(s) : pp. 9344-9353 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Composite  material  Ionic  liquid  Gaseous  effluent  Carbon  dioxide Résumé : In this work, a vinyl-fonctionalized room temperature ionic liquid (RTIL), 1-vinyl-3-butylimidazolium bis-(trifluoromethylsulfonyl)imide ([vbim][Tf2N]), has been successfully synthesized. The RTIL was further polymerized and mixed with 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([bmim][Tf2N]) to form the free-standing poly([vbim]-[Tf2N])-[bmim][Tf2N] composite films. The compositions of [bmim] [Tf2N] in the composite membranes were designed at 15, 30, 45, and 60 wt %. The pristine poly([vbim][Tf2N]) and poly([vbim][Tf2N])-[bmim][Tf2N] composite membranes exhibit similar permeability selectivities as the standard [bmim][Tf2N] but permeabilities are enhanced up to 5 times higher than the equivalent polystyrene-RTIL and polyacrylate-RTIL membranes. An increase in [bmim][Tf2N] concentration of poly([vbim]-[Tf2N])-[bmim][Tf2N] composite membranes results in an increase in solubility, diffusivity, and permeability coefficients of CO2 and N2 but does not change the CO2/N2 selectivities of the solubility, diffusivity, and permeability. The CO2 permeability of the 60 wt % composite at 35°C, 10 atm is 559 barrers in pure gas tests which is closer to 60% of the [bmim][Tf2N] permeability (i.e., 1344 barrers). In addition, the 60 wt % composite membrane exhibits a CO2 permeability of 491.2 barrers and a CO2/N2 selectivity of 20 in mixed gas tests using CO2/N2 (50:50) as the feed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24395879 [article] CO2 Separation from flue gas using polyvinyl-(room temperature ionic liquid)–room temperature ionic liquid composite membranes [texte imprimé] / Pei Li, Auteur ; K. P. Pramoda, Auteur ; Tai-Shung Chung, Auteur . - 2011 . - pp. 9344-9353. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp. 9344-9353 Mots-clés : Composite  material  Ionic  liquid  Gaseous  effluent  Carbon  dioxide Résumé : In this work, a vinyl-fonctionalized room temperature ionic liquid (RTIL), 1-vinyl-3-butylimidazolium bis-(trifluoromethylsulfonyl)imide ([vbim][Tf2N]), has been successfully synthesized. The RTIL was further polymerized and mixed with 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([bmim][Tf2N]) to form the free-standing poly([vbim]-[Tf2N])-[bmim][Tf2N] composite films. The compositions of [bmim] [Tf2N] in the composite membranes were designed at 15, 30, 45, and 60 wt %. The pristine poly([vbim][Tf2N]) and poly([vbim][Tf2N])-[bmim][Tf2N] composite membranes exhibit similar permeability selectivities as the standard [bmim][Tf2N] but permeabilities are enhanced up to 5 times higher than the equivalent polystyrene-RTIL and polyacrylate-RTIL membranes. An increase in [bmim][Tf2N] concentration of poly([vbim]-[Tf2N])-[bmim][Tf2N] composite membranes results in an increase in solubility, diffusivity, and permeability coefficients of CO2 and N2 but does not change the CO2/N2 selectivities of the solubility, diffusivity, and permeability. The CO2 permeability of the 60 wt % composite at 35°C, 10 atm is 559 barrers in pure gas tests which is closer to 60% of the [bmim][Tf2N] permeability (i.e., 1344 barrers). In addition, the 60 wt % composite membrane exhibits a CO2 permeability of 491.2 barrers and a CO2/N2 selectivity of 20 in mixed gas tests using CO2/N2 (50:50) as the feed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24395879

Development of Novel Multichannel Rectangular Membranes with Grooved Outer Selective Surface for Membrane Distillation / May May Teoh in Industrial & engineering chemistry research, Vol. 50 N° 24 (Décembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 14046–14054 Titre : Development of Novel Multichannel Rectangular Membranes with Grooved Outer Selective Surface for Membrane Distillation Type de document : texte imprimé Auteurs : May May Teoh, Auteur ; Na Peng, Auteur ; Tai-Shung Chung, Auteur Année de publication : 2012 Article en page(s) : pp. 14046–14054 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Multichannel  Rectangular  Membranes Résumé : In this study, poly(vinylidene fluoride) (PVDF) multichannel rectangular membranes were spun through the non-solvent-induced phase separation method with the aid of a specially designed spinneret. This unique spinneret has an outer rectangular slit and seven inner needles arranged in series. The newly designed membranes have the combined advantages offered by (1) hollow fiber (i.e., high membrane area per volume ratio and easy assembly into membrane modules); (2) flat sheet membranes (i.e., greater mechanical durability and compressibility); and (3) woven or nonwoven spacers used in flat sheet modules (as mechanical supports). Microscopic views and scanning electron microscopy (SEM) microphotographs show an irregular inner contour align symmetrically in the hydrophobic PVDF membrane. Multichannel rectangular membranes with a grooved pattern have the following advantages: (1) easy handling, (2) can be acted as spacers to discrete membrane from attaching together, and (3) creating eddies flow at the membrane outer selective layer. Attempts are also made to understand the deformation of grooved outer surface and irregular inner contour. Apart from interesting membrane geometry, this study also explores the prospect of utilizing aforementioned membranes for seawater desalination via direct contact membrane distillation (DCMD). A promising distillated flux of 54.7 kg m–2 s–1, using a hot feed brine solution of 80 °C, is obtained through these newly spun multichannel rectangular membranes. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201292j [article] Development of Novel Multichannel Rectangular Membranes with Grooved Outer Selective Surface for Membrane Distillation [texte imprimé] / May May Teoh, Auteur ; Na Peng, Auteur ; Tai-Shung Chung, Auteur . - 2012 . - pp. 14046–14054. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 14046–14054 Mots-clés : Multichannel  Rectangular  Membranes Résumé : In this study, poly(vinylidene fluoride) (PVDF) multichannel rectangular membranes were spun through the non-solvent-induced phase separation method with the aid of a specially designed spinneret. This unique spinneret has an outer rectangular slit and seven inner needles arranged in series. The newly designed membranes have the combined advantages offered by (1) hollow fiber (i.e., high membrane area per volume ratio and easy assembly into membrane modules); (2) flat sheet membranes (i.e., greater mechanical durability and compressibility); and (3) woven or nonwoven spacers used in flat sheet modules (as mechanical supports). Microscopic views and scanning electron microscopy (SEM) microphotographs show an irregular inner contour align symmetrically in the hydrophobic PVDF membrane. Multichannel rectangular membranes with a grooved pattern have the following advantages: (1) easy handling, (2) can be acted as spacers to discrete membrane from attaching together, and (3) creating eddies flow at the membrane outer selective layer. Attempts are also made to understand the deformation of grooved outer surface and irregular inner contour. Apart from interesting membrane geometry, this study also explores the prospect of utilizing aforementioned membranes for seawater desalination via direct contact membrane distillation (DCMD). A promising distillated flux of 54.7 kg m–2 s–1, using a hot feed brine solution of 80 °C, is obtained through these newly spun multichannel rectangular membranes. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201292j

Double - skinned forward osmosis membranes for reducing internal concentration polarization within the porous sublayer / Kai Yu Wang in Industrial & engineering chemistry research, Vol. 49 N° 10 (Mai 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 4824–4831 Titre : Double - skinned forward osmosis membranes for reducing internal concentration polarization within the porous sublayer Type de document : texte imprimé Auteurs : Kai Yu Wang, Auteur ; Rui Chin Ong, Auteur ; Tai-Shung Chung, Auteur Année de publication : 2010 Article en page(s) : pp. 4824–4831 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Osmosis  Membranes Résumé : A scheme to fabricate forward osmosis membranes comprising a highly porous sublayer sandwiched between two selective skin layers via phase inversion was proposed. One severe deficiency of existing composite and asymmetric membranes used in forward osmosis is the presence of unfavorable internal concentration polarization within the porous support layer that hinders both (i) separation (salt flux) and (ii) the performance (water flux). The double skin layers of the tailored membrane may mitigate the internal concentration polarization by preventing the salt and other solutes in the draw solution from penetrating into the membrane porous support. The prototype double-skinned cellulose acetate membrane displayed a water flux of 48.2 L·m−2·h−1 and lower reverse salt transport of 6.5 g·m−2·h−1 using 5.0 M MgCl2 as the draw solution in a forward osmosis process performed at 22 °C. This can be attributed to the effective salt rejection by the double skin layers and the low water transport resistance within the porous support layer. The prospects of utilizing the double-selective layer membranes may have potential application in forward osmosis for desalination. This study may help pave the way to improve the membrane design for the forward osmosis process. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901592d [article] Double - skinned forward osmosis membranes for reducing internal concentration polarization within the porous sublayer [texte imprimé] / Kai Yu Wang, Auteur ; Rui Chin Ong, Auteur ; Tai-Shung Chung, Auteur . - 2010 . - pp. 4824–4831. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 4824–4831 Mots-clés : Osmosis  Membranes Résumé : A scheme to fabricate forward osmosis membranes comprising a highly porous sublayer sandwiched between two selective skin layers via phase inversion was proposed. One severe deficiency of existing composite and asymmetric membranes used in forward osmosis is the presence of unfavorable internal concentration polarization within the porous support layer that hinders both (i) separation (salt flux) and (ii) the performance (water flux). The double skin layers of the tailored membrane may mitigate the internal concentration polarization by preventing the salt and other solutes in the draw solution from penetrating into the membrane porous support. The prototype double-skinned cellulose acetate membrane displayed a water flux of 48.2 L·m−2·h−1 and lower reverse salt transport of 6.5 g·m−2·h−1 using 5.0 M MgCl2 as the draw solution in a forward osmosis process performed at 22 °C. This can be attributed to the effective salt rejection by the double skin layers and the low water transport resistance within the porous support layer. The prospects of utilizing the double-selective layer membranes may have potential application in forward osmosis for desalination. This study may help pave the way to improve the membrane design for the forward osmosis process. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901592d

Formation of cellulose acetate membranes via phase inversion using ionic liquid, [BMIM]SCN, as the solvent / Ding Yu Xing in Industrial & engineering chemistry research, Vol. 49 N° 18 (Septembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8761–8769 Titre : Formation of cellulose acetate membranes via phase inversion using ionic liquid, [BMIM]SCN, as the solvent Type de document : texte imprimé Auteurs : Ding Yu Xing, Auteur ; Na Peng, Auteur ; Tai-Shung Chung, Auteur Année de publication : 2010 Article en page(s) : pp. 8761–8769 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Ionic  liquid Résumé : Ionic liquids have gained worldwide attention as green solvents in the past decade. This study explores, for the first time, the fundamental science and engineering of using ionic liquids as a new generation of solvents to replace traditional organic solvents for the fabrication of flat sheet membranes and hollow fiber membranes. The fundamentals and characteristics of membrane formation of cellulose acetate (CA) membranes have been investigated using 1-butyl-3-methylimidazolium thiocyanate ([BMIM]SCN) as the solvent via phase inversion in water. For elucidation, other solvents, i.e., N-methyl-2-pyrrolidinone (NMP) and acetone, were also studied. It is found that [BMIM]SCN has distinctive effects on phase inversion process and membrane morphology compared to NMP and acetone because of its unique nature of high viscosity and the high ratio of [BMIM]SCN outflow to water inflow. Membranes cast or spun from CA/[BMIM]SCN have a macrovoid-free dense structure full of nodules, implying the paths of phase inversion are mainly nucleation growth and gelation, followed possibly by spinodal decomposition. The recovery and reuse of [BMIM]SCN have also been demonstrated and achieved. The derived flat sheet membranes made from the recovered [BMIM]SCN show morphological and performance characteristics similar to those from the fresh [BMIM]SCN. It is believed that this study could enrich the understanding of membrane formation using environmentally benign ionic liquids. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1007085 [article] Formation of cellulose acetate membranes via phase inversion using ionic liquid, [BMIM]SCN, as the solvent [texte imprimé] / Ding Yu Xing, Auteur ; Na Peng, Auteur ; Tai-Shung Chung, Auteur . - 2010 . - pp. 8761–8769. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8761–8769 Mots-clés : Ionic  liquid Résumé : Ionic liquids have gained worldwide attention as green solvents in the past decade. This study explores, for the first time, the fundamental science and engineering of using ionic liquids as a new generation of solvents to replace traditional organic solvents for the fabrication of flat sheet membranes and hollow fiber membranes. The fundamentals and characteristics of membrane formation of cellulose acetate (CA) membranes have been investigated using 1-butyl-3-methylimidazolium thiocyanate ([BMIM]SCN) as the solvent via phase inversion in water. For elucidation, other solvents, i.e., N-methyl-2-pyrrolidinone (NMP) and acetone, were also studied. It is found that [BMIM]SCN has distinctive effects on phase inversion process and membrane morphology compared to NMP and acetone because of its unique nature of high viscosity and the high ratio of [BMIM]SCN outflow to water inflow. Membranes cast or spun from CA/[BMIM]SCN have a macrovoid-free dense structure full of nodules, implying the paths of phase inversion are mainly nucleation growth and gelation, followed possibly by spinodal decomposition. The recovery and reuse of [BMIM]SCN have also been demonstrated and achieved. The derived flat sheet membranes made from the recovered [BMIM]SCN show morphological and performance characteristics similar to those from the fresh [BMIM]SCN. It is believed that this study could enrich the understanding of membrane formation using environmentally benign ionic liquids. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1007085

Highly water-soluble magnetic nanoparticles as novel draw solutes in forward osmosis for water reuse / Ming Ming Ling in Industrial & engineering chemistry research, Vol. 49 N° 12 (Juin 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 12 (Juin 2010) . - pp. 5869–5876 Titre : Highly water-soluble magnetic nanoparticles as novel draw solutes in forward osmosis for water reuse Type de document : texte imprimé Auteurs : Ming Ming Ling, Auteur ; Kai Yu Wang, Auteur ; Tai-Shung Chung, Auteur Année de publication : 2010 Article en page(s) : pp. 5869–5876 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Magnetic  nanoparticles  Highly  water-soluble  magnetic  nanoparticles Résumé : Highly hydrophilic magnetic nanoparticles have been molecularly designed. For the first time, the application of highly water-soluble magnetic nanoparticles as novel draw solutes in forward osmosis (FO) was systematically investigated. Magnetic nanoparticles functionalized by various groups were synthesized to explore the correlation between the surface chemistry of magnetic nanoparticles and the achieved osmolality. We verified that magnetic nanoparticles capped with polyacrylic acid can yield the highest driving force and subsequently highest water flux among others. The used magnetic nanoparticles can be captured by the magnetic field and recycled back into the stream as draw solutes in the FO process. In addition, magnetic nanoparticles of different diameters were also synthesized to study the effect of particles size on FO performance. We demonstrate that the engineering of surface hydrophilicity and magnetic nanoparticle size is crucial in the application of nanoparticles as draw solutes in FO. It is believed that magnetic nanoparticles will soon be extensively used in this area. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100438x [article] Highly water-soluble magnetic nanoparticles as novel draw solutes in forward osmosis for water reuse [texte imprimé] / Ming Ming Ling, Auteur ; Kai Yu Wang, Auteur ; Tai-Shung Chung, Auteur . - 2010 . - pp. 5869–5876. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 12 (Juin 2010) . - pp. 5869–5876 Mots-clés : Magnetic  nanoparticles  Highly  water-soluble  magnetic  nanoparticles Résumé : Highly hydrophilic magnetic nanoparticles have been molecularly designed. For the first time, the application of highly water-soluble magnetic nanoparticles as novel draw solutes in forward osmosis (FO) was systematically investigated. Magnetic nanoparticles functionalized by various groups were synthesized to explore the correlation between the surface chemistry of magnetic nanoparticles and the achieved osmolality. We verified that magnetic nanoparticles capped with polyacrylic acid can yield the highest driving force and subsequently highest water flux among others. The used magnetic nanoparticles can be captured by the magnetic field and recycled back into the stream as draw solutes in the FO process. In addition, magnetic nanoparticles of different diameters were also synthesized to study the effect of particles size on FO performance. We demonstrate that the engineering of surface hydrophilicity and magnetic nanoparticle size is crucial in the application of nanoparticles as draw solutes in FO. It is believed that magnetic nanoparticles will soon be extensively used in this area. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100438x

Mixed matrix PVDF hollow fiber membranes with nanoscale pores for desalination through direct contact membrane distillation / Kai Yu Wang in Industrial & engineering chemistry research, Vol. 48 N° 9 (Mai 2009) 

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Novel cellulose esters for forward osmosis membranes / Rui Chin Ong in Industrial & engineering chemistry research, Vol. 51 N° 49 (Décembre 2012) 

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Pervaporation dehydration of C2–C4 alcohols by 6FDA-ODA-NDA/Ultem® dual-layer hollow fiber membranes with enhanced separation performance and swelling resistance / Natalia Widjojo in Chemical engineering journal, Vol. 155 N° 3 (Decembre 2009) 

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Polyimide/polyethersulfone dual-layer hollow fiber membranes for hydrogen enrichment / Bee Ting Low in Industrial & engineering chemistry research, Vol. 49 N° 18 (Septembre 2010) 

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PVDF / Nanosilica dual - layer hollow fibers with enhanced selectivity and flux as novel membranes for ethanol recovery / Panu Sukitpaneenit in Industrial & engineering chemistry research, Vol. 51 N° 2 (Janvier 2012) 

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Surface-dissociated nanoparticle draw solutions in forward osmosis and the regeneration in an integrated electric field and nanofiltration system / Ming Ming Ling in Industrial & engineering chemistry research, Vol. 51 N° 47 (Novembre 2012) 

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